A novel high-temperature durable graphene temperature sensor with nano composite protective layer.

Area of Science:

• Materials Science
• Sensor Technology
• Nanotechnology

Background:

• Traditional temperature sensors are limited to below 200 °C.
• High-temperature monitoring is crucial in industries like aerospace and energy.
• Graphene's high-temperature durability is hindered by oxidation.

Purpose of the Study:

• To develop a graphene-based temperature sensor for high-temperature applications.
• To enhance graphene's thermal stability using a composite protective layer.
• To enable reliable temperature monitoring above 200 °C.

Main Methods:

• Fabrication of a graphene sensor with a silicon nitride (SiNx) and aluminum oxide (Al₂O₃) composite protective layer.
• Testing the sensor's performance and durability at temperatures up to 600 °C.
• Characterizing the sensor's resistance change with temperature (positive temperature coefficient).

Main Results:

• The sensor operates effectively in the range of 50-600 °C.
• It demonstrates continuous operation for over four hours at 500 °C.
• A maximum temperature coefficient of resistance (TCR) of 0.17% °C⁻¹ was recorded.

Conclusions:

• The composite protective layer successfully prevents graphene oxidation at high temperatures.
• The developed sensor offers a wide temperature range and long-term stability.
• This technology is promising for high-temperature industrial applications, including energy and metallurgy.